- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄368621 > SI9117 (Vishay Intertechnology,Inc.) High-Frequency Converter for Telecom Applications PDF資料下載
參數(shù)資料
| 型號(hào)： | SI9117 |
| 廠商： | Vishay Intertechnology,Inc. |
| 英文描述： | High-Frequency Converter for Telecom Applications |
| 中文描述： | 高頻轉(zhuǎn)換器的電信應(yīng)用 |
| 文件頁數(shù)： | 1/15頁 |
| 文件大?。?/td> | 132K |
| 代理商： | SI9117 |
Si9117
Vishay Siliconix
Document Number: 70027
S-40750—Rev. E, 19-Apr-04
www.vishay.com
1
High-Frequency Converter for Telecom Applications
FEATURES
On-board high-voltage, 1- Switching FET
Switching Frequencies of Up to 1 MHz
Synchronization Capability
Easily Compensated Current-Mode Operation
Operates with Input Voltages Up to 200 V
1.8-MHz Error Amplifier
Soft-Start
Latched SHUTDOWN
DESCRIPTION
The Si9117 high-efficiency converter for telecom systems
running off 48 V is ideal for emerging applications such as
interactive video (IV) set-top boxes and microcell base
stations, such as those used for Personal Communications
Systems (PCS). IV set-top boxes and microcell base stations
typically require less than 15 W of power and have access to
the analog telephone line power. Both IV set-top boxes and
microcell base stations process extremely low-level,
modulated analog signals (on the order of Vs), making the
frequency and energy content of radiated and conducted
noise a major issue. These application circuits are also
constrained in terms of available board space and place a
premium on minimal footprint.
The combination of an on-board, high-voltage, 1- switch and
a PWM IC with operational input voltage of 200 V allows
operation off of the analog telephone line, even with the worst
case battery voltage and ringing voltage. Once the converter
has started up, a simple bootstrap circuit can provide power to
the IC by raising the source voltage of the n-channel, depletion
mode, start-up FET above its gate voltage of 9.2 V. This
technique lowers system costs, reduces the area required for
circuit implementation, and minimizes circuit power
consumption.
Processing high-frequency, modulated analog signals for
video or RF requires receivers with sensitivities in the range of
0.5 to 25 V. At these levels, noise generated by switchmode
power conversion can impair the signal recovery process.
Controlling radiated noise is a matter of proper layout and
shielding. Controlling conducted noise is a matter of limiting its
energy and isolating the conducted energy’s fundamental and
harmonic frequencies to bands which will not affect the
frequencies of interest. The high-frequency, synchronized
switching of the Si9117 enables this design requirement. First,
for a given output current, high-frequency switching attenuates
output ripple, minimizing conducted energy. Second,
synchronizing the high switching frequency to an external
frequency allows the fundamental and its harmonics to be
moved out of range of the frequency bands of interest. An
additional benefit of high-frequency switching is reduced size
and cost of the inductor and the output filter capacitance.
In addition to these mandatory design considerations, the
Si9117 is easy to design with and compensate, and takes a
minimum of board area to implement: an important benefit in
high-volume/small-package applications such as set-top
boxes and microcell base stations.
The Si9117 is available in both standard and lead (Pb)-free
packages.
APPLICATIONS CIRCUIT
V
OUT
V
IN
Si9117
SHUTDOWN
SYNC
NC
+
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SI9121DB-3 | High-Voltage, Non-Isolated Buck-Boost Converter for ISDN Digital Phones |
| SI9121DB-5 | High-Voltage, Non-Isolated Buck-Boost Converter for ISDN Digital Phones |
| SI9121DY-3 | High-Voltage, Non-Isolated Buck-Boost Converter for ISDN Digital Phones |
| SI9121DY-3-T1 | High-Voltage, Non-Isolated Buck-Boost Converter for ISDN Digital Phones |
| SI9121DY-3-T1-E3 | High-Voltage, Non-Isolated Buck-Boost Converter for ISDN Digital Phones |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SI9117DY | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 1MHz HV Sw Mode Reg RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| SI9117DY-E3 | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Hi Freq Converter For Telecom App RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| SI9117DY-T1 | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Hi Freq Converter For Telecom App RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| SI9117DY-T1-E3 | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Hi Freq Converter For Telecom App RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| SI9118 | 制造商:VISHAY 制造商全稱:Vishay Siliconix 功能描述:Programmable Duty Cycle Controller |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。